Brake



T J. sNEED Aug. 25, 1931;

BRAIKE A Filed oct. 4. 192s duozuew Patented'Augk. 25, 1931 UNITED STATES PATENT oFFlcE JOHNv SNEED, F FERNDALE, MICHIGAN; .ASSIGNOR T0 THE MIDLAND STEEL PRODUCTS COMPANY, OF CLEVELAND, OHIO, A CORPORATION 0F OHIO BRAKE" i Application leil October 4,

` This invention f relates tovehicle brakes and more particularly to a brake of the aux: iliary servo'shoe type wherein the manually applied or directed force is directed to an .5 auxiliary shoe, which auxiliaryshoe acts as the expanding means for the main -friction l element or elements. In my copending application, Serial No. 223,020, filed September 30th, 1.927,1 have illustrated this general type of brake and my present invention constitutes an jim provement upon the former' invention particularly in structure and arrangement parts. It is among the objectsof myflinven-g.y tion` to provide a brake ofsi-mple construe-'I tion, comprising few easily assembled parts. Another object is to simplify the arrangement of the auxiliary shoe 'with relation to the anchor pin and the ends of the main shoe.

parts for the main shoe of` which, the body parts are substantially diilerent. Another object is to devise Van auxiliary shoe 'readily cooperable witl'r a 'simple operating mech- .v y y i 'rolleror-icam engaging surface 24. The

anism. y Other lobjects will appear from the following description of a preferred form 'of my invention, reference being had tothe accompanying drawings.

characteristics are summarized i`n the'claims.

In the drawings, Fig. 1 is an elevation of',- the assembly including the main andfauxf iliary shoes and Fig. 2 is a section taken along the lines 2 2 'of Fig. '1. y

Referring to the drawings, I `have illustrated in my brake the usual brake drum D, the open face of which i`svclosedby an apron A, which apron'carries by means of a bracki et B an anchor pin P. Supported by the'.

4o apron and held out of contact with the drum when idle, -is a brake shoe S carryingI suitable friction material L; The shoe S may comprise a relatively rigid. channel party 1 and a relatively flexible band like part 2 joined together as at 3. The end of the band like part 2 has a channel shaped part 4, secured to it so that both ends ofthe shoe Referring also to Fig.` 2,'the ends' of the 5o side flanges of the channel shaped parts-are .-iliary shoe` 20, 4see also formed in a modified T-section by securing. Another object is to arrange like end The essential 192e. serial no. 310,267.

justable spring-centering means 6 simi-lar to that illustrated in my copening application' Serial No. 281,062 filed May28pth, 1928. Briefly stated, .this centering device comprises a pair of springs 7 and Shaving their remote ends secured to the body of theyshoe as at 9 and 10 and having their near end l:secured to a plate 11,`wh ich is adjustably 'clam-pcd. to the apron. v. y ,g1 To operate thebrake, I provide an auxa pairof channels 21 and 22 back to bac by such. meansyas welds 23. The 4shoe carries suit'ablefriction 'material L along the part comparable to the head of the-T and has atthe base of the lT a smooth arcuate body of the shoe may be, apeitured` as .at 25 to encompass the anchorpinand `to be free to move in all directions relative' to the anchor pin. within the greatest limits of its travel in operation. l l l v. `The Webs 0f the channeled ends j of the main shoe are inclined radially inward as `at Fig. 2,v which is 30 and each-of these Webs-are "slotted cirw cumferentiallyv as at '31, see also 2, to receive the body of the.V auxiliary.' shoe.

When the shoes are lin idle position, the ends of the auxiliary shoe are adjacent the bottoms or ends ofthe slots in the'end of the main shoe as at 32 but preferably out of contact therewith so that the both ends of the main shoe may be drawn against theanchor pin in idle position.

Joining the ends of the auxiliary shoe and parts near the ends of the main shoe, are retractor springs 401 and 41, which hold the .ends of the mainshoe upon the anchor and which draw the auxiliary shoe radially ineward until it rests, at least at its ends, upon the webs of the channeled ends of the main shoe as at.33.` Thus in idle position all of' the parts are snuggly held together and rattling is avoided.

To operate the brake, the auxiliary shoe is moved radially into engagement with the drum whereupon it` is carried by contact with the drum inthe direction of drum rotation, and as the auxiliary shoe is carried by the drum, it engages one or the other of the ends of the main shoe thereby forcing the main shoe into wrapping engagement with the drinn. To move the auxiliary shoe radially, I provide a roller or similar means 5() eccentrically cai'ried by a shaft 51 which is liournallml in the bracket B and has a rigidly fixed operating arm 52, which may be actuated by suitable well known means not illustrated herein.

It suffices to say that forces tending to rotate the shaft 5l may be applied through the arin 52 to rotate the shaft counter-clockwise as viewed in Fig. l to raise the roller and' thereby move the auxiliary shoe radially outward and upwardly as viewed in Fig. 1. The roller engages the smooth lower surface 24 of the base'of the auxiliary shoe and through the roller a radial pressure is maintained While the auxiliary shoe is carried circumferentially away from its idle position by Contact with the drum.

From the foregoing, it will appear that a brake according to my invention is simple in construction; that the arrangement vofl the auxiliary shoe and its disposition ad]a\ cent the anchor pin and its interittingfrelation with the ends o f the main shoe 'and is eininately. simple and rugged; that the parts comprising my brake are few in number and of character that is adapted to quantity production; and that the assembly of the parts may be quickly and easily accomplished.

While I have illustrated and described a preferred. form of my invention, lvarious modifications will appear to those skilled in the art all within its scope, and I do lnot care tQ be limited inV this or any manner other than by the claims appended hereto.

I claim :f-

1.` In a brake, the combination of a friction device having oppositely disposed adjacent channel shaped ends, anl auxiliary shoe arranged to act on either of the ends of said device having a lining supporting part overlying the ends thereof and having an inwardly extending reinforcing Apart dis posed between the side flanges of the said ends.

2. In a brake, the combination of a main shoe having adjacent channel shaped ends, an auxiliary shoe arranged to act on either of the ends of the main shoe having a lining supporting part overlying the ends of 'first named shoe and having an inwardly extending reinforcing part disposed between the side flanges of the ends of the main shoe.

3. In a'brake, the combination of a, malin shoe having an arcuate lining supporting part and an extension thereof with spaced radial la-nges,'an auxiliary shoe having a lining supporting part overlying .said extension andhaving a radial flange disposed between the flanges thereof.

4. In a brake, the combination of a main shoe having an arcuate lining supporting part and an extensionv thereof with spaced radial flanges, an auxiliary shoe having a lining supporting part overlying said ex-l tension of the main shoe and having a radial flange bisecting said extension and disposed between the f laiiges thereof. v

5. In a brake, the combination of a main shoe having channeled portions at its ends with a circumferentially extending web and inwardly extending radialy side flanges., said web being circumferentially slotted, Aand an auxiliary shoe having an inwardly extending reinforcing flangeparallel and spaced between said side flanges and disposed within the slot in said web and engaging the end of the slot of said web to move said shoe. y 6. In a brake, the combination of a main shoe having a channelled portion at its ends with a circumferentially extending web and radially extending side flanges, said web being centrally slotted, and an auxiliary shoe having a centrally disposed inwardly extending reinforeing flange disposed` within the slot in said web and engaging `the end of the slot of said web to move said shoe.

7. In a brake, the combination of a main friction element including a curved band like part, a channel shaped partY secured at the end of the band like part and extending beyond the end thereof and having its web notched or slotted circumferentially to receive and guide at least a part of an adjacent shoe. s

8. In a brake, the combination of a main friction element including a curved band like part, a channel shaped part secured at the end of 'the band like part and extending beyond the end thereof and having its web diverted inwardly from a continuation of Athe arc of the-band like part and having its web notched or slotted circumferentially to receive and guide an adjacent shoe.

9. A brake including a shoe having an arcuate lining supporting part with an integrally formed portion extending beyond the lining supporting part, said portion being circumferentially notched or slotted4 to receive a radially disposed,member through vwhich expanding forces may be delivered to Leconte' circumferentiallynotched or slotted, in combination with a. T-shaped s hoe having a radial part lying in the notch or slot and having a lining supporting part overlying the inwardly inclinedportlon.

11. In a brake, the -combination of an -anchor pin, a'friction element having end parts engageable with said anchor pin at least in ldle position, anda shoe having a bodyl partl encompassing said anchorpin and engageable with at least one of the end parts of said friction element to move it from the anchor pin when the brake is applied. c

12. In a brake, the combination of an anchor pin, a friction element having end parts engageable with said anchor pm, at

least in idle position and a shoe having a' body part freely encompassing said anchor pin and engageable with either of the end parts of said friction element to move one of them from the anchor pin when the brake is applied depending upon the direction of drum rotation.

shoe having axially spaced end parts engaging the anchor pin at least in idleposition, and an auxiliary servo shoe overlying the anchor pin and having an inwardly extending part lying between the said axially spaced end parts ofthe main shoe.

15. In a brake, the combination of an anchor pin, a substantially annular main shoe having axially spaced end parts engaging the anchor pin at least in idle posiengagement withthe brake drum and means 17. A brake accordinglto 4claim 16 having a second shoe with at least one end engageable with said anchor in idle position and engageable with said first named shoe to be forced away from said anchor into engagement with the brake drum when said first named shoe is carried circumferentially by contact with the brake drum.

18. In a brake, the combination lof an apron, a bracket secured thereto, an anchor 1n carried by the bracket, a rotatable shaft )ournalled in the bracket, a roller eccentrically mounte'd on said shaft, a T-shaped brake shoe having an inwardly extendlng apertured part encompassing said anchor and engageable by said roller and movable radially into engagement with the brake drum.

19. A brake according to claim 18 having a shoe with opposite ends engageable with said anchor at least in idle position and engageable with said first named shoe tov be forced away from said anchorinto engagement with the brake drum when said first the direction of drumrotation. In testimony whereof, I hereunto affix my signature.

'JOHN SN EED.

tion, an auxiliary servo lshoe overlying the 4 anchor and having an inwardly extending part lying .between the said axlally spaced end parts of the main shoe and means including an eccentrically mounted roller engaging the said inwardly extending part of the auxiliary servo shoe for moving it radially into engagement with the brake drum and formaintaining a radial pressure while the auxiliary servo shoe'moves circumferentially relative to the anchor pin.

16. In a brake the combination of an apron, a bracket secured thereto, an anchor pin carried by the bracket, a rotatable shaft j ournalled in the bracket, a roller eccentrically mounted on said shaft, a brake shoe having an'inwardly extending apertured part encompassing said anchor and engageable with said 4roller and movable radially into 

